I got to a screen after about 20 minutes asking me to login to my Google account. At first when I clicked the sign in button I thought nothing happened, but when I slid open the keyboard I saw that the login screen was there, but it was so so so dim I could barely read it. I typed in my login and clicked the sign in button, but the next screen that shows up is so dim I can't read it. How can I brighten the screen, when I can't read anything? Help!